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Remote Sensing Electromagnetic Radiation

Remote Sensing Electromagnetic Radiation. Remote Sensing Definition. "I want to know how God created this world. I am not interested in this or that phenomenon, in the spectrum of this or that element. I want to know His thoughts; -the rest are details.“ Albert Einstein.

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Remote Sensing Electromagnetic Radiation

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  1. Remote SensingElectromagneticRadiation

  2. Remote Sensing Definition "I want to know how God created this world. I am not interested in this or that phenomenon, in the spectrum of this or that element. I want to know His thoughts; -the rest are details.“ Albert Einstein

  3. Remote Sensing Definition • Science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with object, area, or phenomenon.

  4. Remote Sensing Processes • Data acquisition         - energy sources         - energy through the atmosphere         - interaction with surface features         - retransmission         - sensor systems         - data - interpretation and analysis

  5. Remote Sensing Processes ..

  6. Remote Sensing Processes .. • Data analysis:         - data processing         - compilation         - application • “DIKI” data information knowledge intelligence

  7. Electronic Radiation • The sun produces a full spectrum of electromagnetic radiation http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html http://kr.blog.yahoo.com/bmw26z/2188

  8. Two Components of EM Radiation • Electrical field (E): varies in magnitude in a direction perpendicular to the direction of propagation •  Magnetic field (M): at right angle to the electrical field, is propagated in phase with the electrical field

  9. Components of EM Radiation v

  10. Three Properties of EM Energy • Wavelength (l) • Frequency (n) • Amplitude

  11. Wavelength (l) • The distance from one wave crest to the next • Measurement units: micrometer (mm)  1m = 1,000 mm, 1mm = 1,000microm

  12. Frequency (n) • The number of crests passing a fixed point  in a given period of time • Measure units: hertz (cycle per second) 

  13. Amplitude • The height of each peak • Measured as watts per square meter (energy level)

  14. Three Properties • Among the three properties, wavelength is the most commonly used in the field of remote sensing

  15. Three Properties ..

  16. Speed of EM • The speed of EM energy  c  300,000km/second,   c = nl • l and n are inversely related

  17. Electromagnetic Spectrum • Spectrum of electromagnetic radiation • Major divisions of EM spectrum http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html http://imagers.gsfc.nasa.gov/ems/ems.html

  18. Major Divisions of EM Spectrum • Ultraviolet spectrum: 0.3 - 0.38microm •  Visible spectrum:         - blue  0.4 - 0.5microm         - green 0.5 - 0.6microm         - red   0.6 - 0.72microm • 1m = 1,000mm = 1,000,000 micrometer

  19. Major Divisions of EM Spectrum • Infrared spectrum:         - near infrared: 0.72 - 1.3microm         - mid infrared:  1.30 - 3.0microm         - far infrared:  7.00 - 15microm, emitted from the earth • Microwave spectrum: 1mm - 1m

  20. The Dual Nature of Light (Newton) • Light is formed by a stream of quanta (photons) that travels in straight line. The size of each quantum is directly proportional to the frequency of the energy's radiation                     Q = hn • The quantum model best explains the photoelectric effect

  21. The Dual Nature of Light • EM energy propagates as a series of waves • The wave model best explains the refraction and diffraction

  22. Readings • Chapter 1

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